qt-everywhere-src-5.14.1/qtwayland/src/compositor/shaders/surface_y_u_v.frag

uniform highp sampler2D tex0;
uniform highp sampler2D tex1;
uniform highp sampler2D tex2;
varying highp vec2 v_texcoord;
uniform lowp float qt_Opacity;

void main() {
  float y = 1.16438356 * (texture2D(tex0, v_texcoord).x - 0.0625);
  float u = texture2D(tex1, v_texcoord).x - 0.5;
  float v = texture2D(tex2, v_texcoord).x - 0.5;
  y *= qt_Opacity;
  u *= qt_Opacity;
  v *= qt_Opacity;
  gl_FragColor.r = y + 1.59602678 * v;
  gl_FragColor.g = y - 0.39176229 * u - 0.81296764 * v;
  gl_FragColor.b = y + 2.01723214 * u;
  gl_FragColor.a = qt_Opacity;
}